Main Stage-
System of a Down- Reunion tour will be huge for this band.
Avenged Sevenfold- Band will bring in a bunch of kids, did a date last year, plus if they pick a good set, they're good live.
Deftones- Would bring in a pretty good draw, great band, can definitely see them doing this tour.
Trivium- They've basically said they're on this tour. Could definitely see them opening the main stage.

Jager Stage-
All That Remains- Can see them headlining this stage. New album is pretty good, fun live band.
Arch Enemy- Strongly rumored for this, would be a good fit with the ACTUAL metal fans. Yet to see them live, would like too.
Unearth- Great live. Has been asking fans to vote for them on twitter for this tour, Shadows Fall did the same thing last year and got on it.
Jager Band- no explanation needed.

Silver Star Stage-
As I Lay Dying- Yet to do this fest, awesome live, could definitely headline this stage.
Children of Bodom- Popular amongst metal fans, wouldn't doubt that they're on it this year.
GWAR- Have been highly rumored to do it, I've yet to see them live, but heard it's amazing.
Born of Osiris- Band is getting pretty big. Always has a deathcore band on here. Good live.
Skeletonwitch- Fans have been asking for this band for awhile, plus they played Ozzfest last year.

Also wouldn't be suprised if DevilDriver/Dimmu Borgir take 2nd Stage spots or if Godsmack was on Main Stage.

Trivium- 40 Minutes
1. The End of Everything
2. Rain
3. Down From The Sky
4. New Song
5. Throes of Perdition
6. Shattering The Skies Above
7. A Gunshot To The Head of Trepidation
8. Pull Harder on the Strings of Your Martyr

Jagermeister Stage-
All That Remains- 35 Minutes
1. Now Let Them Tremble...
2. For We Are Many
3. Six
4. Forever In Your Hands
5. This Calling
6. Some of the People, All of the Time
7. This Darkened Heart
8. The Air That I Breathe
9. Two Weeks

A Perfect Circle - APC is not as heavy as Tool, but i think it would still work

System of a Down - a reunion tour is possible, why not Mayhem?

Black Label Society - I'm just a huge fan of anything that has to do with Zakk

Anthrax - one of the big 4, come on

Silverstar Stage

In Flames - I love in flames, they are a great band with some kickass music

Children of Bodom - pretty much same as In Flames

Between the Buried and Me - I could write paragraphs, no, essays on this. Between the Buried and Me is one of the most creative and interesting progressive metal bands in the world. They would definitely fit the bill for mayhem festival.

Nile - Its Nile...death metal....you need some death metal at Mayhem

Jagermeister Stage

This is Hell - Great live show and a fun band to see, though their music sucks

SkeletonWitch - I hate them, but i needed to fill a spot. plus its a possibility

A Hero A Fake - I don't know if anyone else has heard of them but they are a fun band to listen to and would make a good edition to Mayhem

The Faceless - being 100% honest, i don't know their music. this is a placeholder